Buckle



FIG. 1 is a perspective view showing the new design for a buckle;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof, a bottom view being a mirror image thereof; and,

FIG. 7 is a perspective view thereof showing the buckle with a strap.

The portions of the buckle shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a buckle, as shown and described. 